5 years ago

Aminoethanethiol-Grafted Porous Organic Polymer for Hg2+ Removal in Aqueous Solution

Aminoethanethiol-Grafted Porous Organic Polymer for Hg2+ Removal in Aqueous Solution
Seenu Ravi, Dong-Wha Park, Pillaiyar Puthiaraj, Wha-Seung Ahn, Kyung Ho Row
A highly porous organic polymer, CBAP-1, was synthesized from terephthaloyl chloride and 1,3,5-triphenylbenzene via the Friedel–Crafts reaction, and functionalized with either ethylenediamine (EDA) or 2-aminoethanethiol (AET) for Hg2+ removal from water. Both materials were characterized by X-ray diffraction, N2 adsorption–desorption isotherms, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, inductively coupled plasma and elemental analysis, and the stability of the porous polymers under different pH and temperature conditions was examined. The adsorption experiments were carried out by varying contact time, Hg2+ concentration, and system pH to study the adsorption equilibrium and kinetics. The Hg2+ ion-adsorption capacities of CBAP-1(EDA) and CBAP-1(AET) were 181 and 232 mg/g, respectively, at room temperature and pH 5, and the observed adsorption isotherms could be fitted well to the Langmuir model (correlation factor R2 > 0.99). Under the optimum set of conditions, the adsorption equilibrium for CBAP-1(AET) was reached within a contact time of 10 min; CBAP-1(AET) exhibited an excellent distribution coefficient of greater than 2.41 × 107 mL/g. The adsorption kinetics could be satisfactorily described by a pseudo-second-order model. Hg2+ recovery in the presence of commonly coexisting metal ions such as Na+, Ca2+, Mg2+, Pb2+, and Fe3+ was also investigated. CBAP-1(AET) showed high Hg2+ selectivity against other ions except Pb2+. CBAP-1(AET) was superior to CBAP-1(EDA) in terms of overall performance; it could efficiently remove >96% of Hg2+ ions in 2 min from a 100 ppm of Hg2+ solution. The material could be reused for 10 consecutive runs with negligible loss in adsorption capacity.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02743

DOI: 10.1021/acs.iecr.7b02743

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